Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 16)

<1.Overview>
1-1
IM 11M12A01-04E
1. Overview
The EXAxt ZR Integrated type Zirconia Oxygen Analyzer is used to monitor and control the oxygen
concentration in combustion gases, in boilers and industrial furnaces, for wide application in industries
which consume considerable energy-such as steel, electric power, oil and petrochemical, ceramics,
pulp and paper, food, or textiles, as well as incinerators and medium/small boilers. It can help conserve
energy in these industries. The EXAxt ZR also contributes to preservation of the earth’s environment
in preventing global warming and air pollution by controlling complete combustion to reduce CO
2
, SOx
and NOx.
The EXAxt ZR Integrated type Zirconia Oxygen Analyzer integrates both probe and converter. The
analyzers need not use a sampling device, and allow direct installation of the probe in the wall of a flue
or furnace to measure the concentration of oxygen in the stack gas of the temperature up to 700°C.
The probe uses a high-reliability Zirconia sensor and a heater assembly that can be replaced on site.
The analyzer is equipped with three infrared switches, which enable the user to operate the equipment
without opening the cover on site. Analyzer calibration can also be fully automated and the automatic
calibration unit is provided. Choose the equipment which best suits your needs so that an optimal
combustion control system can be obtained.
Some examples of typical system configuration are illustrated below:
1.1 < EXAxt ZR > System Configuration
The system configuration should be determined by the conditions; e.g. whether the calibration is to
be automated, and whether flammable gas is present and requires safety precautions. The system
configuration can be classified into three basic patterns as follows:
1.1.1 System 1
This is the simplest system consisting of an integrated type analyzer. This system can be implemented
for monitoring oxygen concentration in the combustion gases boiler. No piping is required for the
reference gas (air) which is fed in at the installation site. The ZO21S standard gas unit is used for
calibration.
Zero gas from this unit and span gas (air) is sent to the probe through a tube which is connected
during calibration.
~
ZR202G Integrated type Zirconia Oxygen Analyzer
ZO21S Standard gas unit
Stop valve
Calibration gas
F1.1E.ai
~
100 to 240 V AC
100/110/115
200/220/240 V AC
Contact input
Analog output, contact output
Digital output (HART)
Figure 1.1 Example of System 1